VOA慢速英語(yǔ)：VOA采訪美國(guó)能源部長(zhǎng)

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U.S. Energy Secretary Rick Perry sees exporting technologies like carbon capture utilization, so-called “clean coal” technology, to ensure American energy security. In an interview with VOA Contributor Greta Van Susteren, Perry called battery development “the Holy Grail” of energy production.